Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 073 Issued at 2200Z on 13 Mar 2012

IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z

Solar activity increased to high levels. Region 1429
(N18W62) produced a long duration M7 flare at 13/1741Z associated
with Type II and IV radio sweeps (estimated velocity 1366 km/s), a
1400 sfu Tenflare, and an assymetric-halo CME (plane-of-sky velocity
1375 km/s) with a mostly northwest trajectory. The geoeffectiveness
of this CME is currently under evaluation.

IB. Solar Activity Forecast

Solar activity is expected to be low
to moderate with a slight chance for an X-class flare until Region
1429 rotates off the visible disk on 15 March. Day 3 (16 March)
solar activity is expected to decrease to low levels with a slight
chance for isolated moderate activity.

IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z

The geomagnetic field was quiet to unsettled. The greater than 10
MeV and greater than 100 MeV protons became rapidly enhanced just
after the M7 flare with associated CME. The greater than 10 MeV
event began at 13/1810Z, reached a maximum flux of 469 PFU at
13/2045Z and is decreasing. The greater than 100 MeV event also
began at 13/1810Z, reached a maximum flux of 18.9 PFU and is also
decreasing. The greater than 2 MeV electron flux at geosynchronous
orbit reached high levels during the period.

IIB. Geophysical Activity Forecast

Geomagnetic activity is
expected to be at quiet levels on days one and two (14 and 15
March). Activity is expected to increase to quiet to unsettled
conditions on day 3 (16 March) due to a recurrent coronal hole
high-speed stream.

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